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The following outline is provided as an overview of and topical guide to birds: Birds (class Aves) – winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. There are around 10,000 living species, making them the most varied of tetrapod vertebrates.
Animals: Amphibians · Arachnids · Birds · Cnidaria · Crustaceans · Echinoderms · Fish · Insects · Mammals · Molluscs · Reptiles · Others Anchorage White Raven , by Lisa Hupp/ USFWS Brown-banded antpitta , by Charlesjsharp
Birds are a group of warm-blooded vertebrates constituting the class Aves (Latin:), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.
In this list of birds by common name 11,278 extant and recently extinct (since 1500) bird species are recognised. [1] Species marked with a "†" are extinct. Contents
In vertebrates, the circulatory system is a system of organs that includes the heart, blood vessels, and blood which is circulated throughout the body. [1] [2] It includes the cardiovascular system, or vascular system, that consists of the heart and blood vessels (from Greek kardia meaning heart, and Latin vascula meaning vessels).
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Adult wedge-tailed eagles are usually solitary or occur in pairs but immatures are more gregarious. 10–15 young wedge-tailed eagles may rest or soar together or even hunt together and up to 40 have been recorded at once at a carcass. [4] Mated adults perform mutual soaring, undulating dives, and tandem flights with rolling and foot-touching.